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The first will dump heavy snow from the central plains towards the mid-Atlantic coast until Tuesday evening. The thickest snow will pile up in Iowa. Some of the snow will be very heavy with snowfall rates of up to 2 inches per hour, the Weather Prediction Center says.
“If these snow totals materialized, they would be very rare for Iowa,” wrote the National Weather Service in Des Moines.
“On average, a single daily snowfall of a foot or more historically only occurs every 15 to 20 years.”
If a foot of snow falls in Des Moines in one day, it will only be the tenth time that a foot or more has fallen since 1884. The last time they saw so much snow in one day was in 2004 .
“Snow in the Midwest is not uncommon,” said CNN meteorologist Chad Myers, who has spent years forecasting snow on the plains.
What makes this system rare is the amount that should drop in a day. Des Moines is much more likely to see more than a foot of snow accumulate over two or three days.
“This storm with such a large area of 12 to 18 inches can stretch the road clearing assets,” Myers said. “Be prepared to be stuck for a few days.”
Outside of Iowa, snow over 4 inches is expected from Kansas to Michigan.
It’s not just snow that can cause problems. Ice could build up just south of the snow that stretches from Kansas to New Jersey. Up to a tenth of an inch of ice with localized spots up to a quarter of an inch could form.
“Travel can quickly become dangerous in parts of this region,” according to the forecasting center.
Rain will fall in the southeast, where daily temperatures will be above average. Severe storms can develop in the Mississippi Valley, including eastern Arkansas and western Tennessee
Atmospheric West Coast River Could Bring Snow Record
Another system is expected to cross the region from Tuesday to Wednesday.
“The mid-week system that lines up with a surge in atmospheric humidity has the potential to dump an extreme amount of precipitation, which could flirt with record-breaking snowfall duration in parts of southern parts of the region. California and the western Grand Basin, ”said Jenn Varian, meteorologist with the Las Vegas Weather Service.
The Sierra Nevada is expected to bear the brunt of the moisture with this system, Varian said, but additional fallout could be possible depending on the height of the storms.
Mountain ridges could see between 60 and 100 inches of snow Tuesday night through Friday morning.
Northwestern California, as of Monday, is expected to receive the most precipitation. “Moisture plumes with AR (Atmospheric River) events are always delicate and may not know more details until the event begins to unfold,” the San Francisco National Weather Service office said. .
Atmospheric rivers are long, narrow regions of the atmosphere – like rivers in the sky – that carry water vapor, according to the National Oceanic and Atmospheric Administration.
Rain totals forecast for Tuesday through Thursday evening range from 2.5 to 4.5 inches in low elevation locations. In comparison, the hills could see 6 to 8 inches, maybe even isolated amounts of 10 to 13 inches of rain.
Ahead of this mid-week system, much of the region will experience high winds. Strong wind warnings and advisories are being posted from Los Angeles to Phoenix, where winds will be 45 to 55 mph today.
From Tuesday through Wednesday, winds could reach 60 mph over parts of California.
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